<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Insert title here</title>
</head>
<body>
	<script type="text/javascript">
		var a = 1, b = 4, c = 3, d = 20, e = 11;
		var newA = d + e, newB = e + a;
		e = c + d;
		d = b + c;
		c = a + b;
		a = newA;
		b = newB;
		alert(a);
		alert(b);
		alert(c);
		alert(d);
		alert(e);
	</script>

</body>
</html>